Home › Forum › Ask A Member › 1957 Evinrude 18HP will not start › Re: 1957 Evinrude 18HP will not start
First of all make sure your compression reading is correct. Assuming your gauge is accurate you will need to give about 3 pulls to get a final maximum reading. Might get about 95 on the first pull, then 110-115, then 125 on the last pull. Also must do it when the motor is cold and dry. Warm motor may give slightly false low readings. Adding oil or even flooded fuel can give a false high reading. If 95 PSI is truly the correct reading, you are in for a ring job, cylinder honing, etc. I have several extra 18 HP OMC powerheads with about 95-105 PSI that are on my list for rebuild. Not going to happen anytime soon though as I have plenty of good runners.